package demo4.mapper;

import demo4.pojo.User;
import demo4.util.IDBUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

@Component
public class UserMapper implements IUserMapper {

    @Autowired
    private IDBUtil dbUtil;

    public int insert(User user){
        System.out.println("UserMapper：用户插入数据");
        try(Connection connection = dbUtil.getConnection();){
            String sql = "insert into users(username,password,nickname,age)" +
                    "values(?,?,?,?)";
            PreparedStatement ps = connection.prepareStatement(sql);
            ps.setString(1,user.getUsername());
            ps.setString(2,user.getPassword());
            ps.setString(3,user.getNickname());
            ps.setInt(4,user.getAge());
            return ps.executeUpdate();
        }catch (Exception e){
            e.printStackTrace();
        }
        return 0;
    }

    @Override
    public User selectByUsername(String username) {
        try(Connection connection = dbUtil.getConnection();) {
            String sql = "select * from users where username = ?";
            PreparedStatement ps = connection.prepareStatement(sql);
            ps.setString(1,username);
            ResultSet rs = ps.executeQuery();
            if(rs.next()){
                User user = new User();
                user.setId(rs.getInt("id"));
                user.setUsername(rs.getString("username"));
                user.setPassword(rs.getString("password"));
                user.setNickname(rs.getString("nickname"));
                user.setAge(rs.getInt("age"));
                return user;
            }
        } catch (Exception e){
            e.printStackTrace();
        }
        return null;
    }

    @Override
    public int update(User user) {
        try(Connection connection = dbUtil.getConnection();) {
            String sql = "update users set password = ?,nickname = ?,age = ? where username = ?";
            PreparedStatement ps = connection.prepareStatement(sql);
            ps.setString(1,user.getPassword());
            ps.setString(2,user.getNickname());
            ps.setInt(3,user.getAge());
            ps.setString(4,user.getUsername());
            return ps.executeUpdate();
        } catch (Exception e){
            e.printStackTrace();
        }
        return 0;
    }

    @Override
    public List<User> selectAll() {
        List<User> list = new ArrayList<>();
        try(Connection connection = dbUtil.getConnection();) {
            Statement state = connection.createStatement();
            String sql = "select * from users";
            ResultSet rs = state.executeQuery(sql);
            while (rs.next()){
                User user = new User();
                user.setId(rs.getInt("id"));
                user.setUsername(rs.getString("username"));
                user.setPassword(rs.getString("password"));
                user.setNickname(rs.getString("nickname"));
                user.setAge(rs.getInt("age"));
                list.add(user);
            }

        } catch (Exception e){
            e.printStackTrace();
        }
        return list;
    }

    @Override
    public int deleteByUsername(String username) {
        try(Connection connection = dbUtil.getConnection();) {
            String sql = "delete from users where username = ?";
            PreparedStatement ps = connection.prepareStatement(sql);
            ps.setString(1,username);
            return ps.executeUpdate();
        } catch (Exception e){
            e.printStackTrace();
        }
        return 0;
    }
}
